A difference frequency technique for improving IM performance of RF amplifiers

✍ Scribed by Djuradj Budimir; M. Modeste; Colin S. Aitchison

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 120 KB
• Volume: 24
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/(sici)1098-2760(20000205)24:3<208::aid-mop19>3.0.co;2-7

✦ Synopsis

A difference frequency technique for reducing the IM product le¨els in a nonlinear RF amplifier is presented. The technique is based on the standard two-tone test. The two sinusoid signals together with their difference frequency signal are fed into the amplifier. CAD simulation shows that the third-order IM le¨el at the output of a nonlinear amplifier can be reduced using this technique. The results of a related experiment are reported, which ga¨e a measured of 50 dB reduction in the le¨el of the third-order intermodulation without affecting the fundamental power le¨els.